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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b7cc99dcfc1496d69bd5bbaf491ce94a5bd44145278f47d8dcf134a5b3707f0' 
  AND token = '7Wpetv3tNX7XjhNuSxH43/a4EuO5910Vm/p9c2fRj4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}